How should I do to merge 2 audio files in MP3?

My wish is just to combine 2 file. No editing.

There are some radio shows that split into separate 1 hour parts. I download them (in real or wma format). I convert the into MP3 - my intended target. Now I just wish to merge them.

I have all your products. Even WMecorder etc.

Ideas?

-- Bjarne